const ppp = require('calc.js')
Page({
  data: {
    num: '0',
    op: ''
  },
  lastNum: 0,
  isNewNum: false,
  clear() {
    this.isNewNum = true
    this.lastNum = 0
    this.setData({
      num: '0',
      op: ''
    })
  },
  delete() {
    let num = this.data.num
    num = num.substr(0, num.length - 1)
    num = num == "" ? '0' : num
    this.setData({
      num
    })
  },
  numbtn(e) {
    console.log(e)
    let val = e.currentTarget.dataset.val
    let num = this.data.num
    if (num == "0" || this.isNewNum) {
      num = val
      this.isNewNum = false
    } else {
      num += val
    }
    this.setData({
      num
    })
  },
  dotbtn() {
    let num = this.data.num
    if (num.indexOf('.') >= 0) {
      return
    }
    if (num == '0') {
      num = '0.'
    } else {
      num += '.'
    }
    this.setData({
      num
    })
  },
  opbtn(e) {
    console.log(e)
    let op = this.data.op
    let val = e.currentTarget.dataset.val
    let curNum = Number(this.data.num)
    this.setData({
      op: val
    })
    this.isNewNum = true
    if (this.lastNum == 0) {
      this.lastNum = curNum
      return
    }
    if (op == "+") {
      this.lastNum = ppp.add(this.lastNum,curNum)
    } else if (op == '-') {
      this.lastNum = ppp.add(this.lastNum,curNum)
    } else if (op == '*') {
      this.lastNum = ppp.add(this.lastNum,curNum)
    } else if (op == '/') {
      this.lastNum = ppp.add(this.lastNum,curNum)
    } else if (op == '%') {
      this.lastNum %= curNum
    } else if (op == '=') {
      this.lastNum = curNum
    }　　　　　　　　　　　
    this.setData({
      num: this.lastNum
    })
  }
})
